Student or Learner
I was six-three, but the guy facing me had me by at least two inches.
I understand he was taller at least 2 inches than me?
He had at least 2 inches and 20 pounds on me = he was two inches taller and twenty pounds heavier.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.